My WHDG uses a natural key (varchar)as the pk and some pk data have spaces in them ( e.g. "Product Line A").
The related hierarchical child product data use int surrogate keys.  When I attempt to expand rows where the pk has a space in it, I get the following pop-up error:  (Rows with no space expand normally.

<ig:WebHierarchicalDataGrid ID="hdgPrdln" runat="server" Height="350px" Width="640px"
                AutoGenerateBands="False" AutoGenerateColumns="False" DataKeyFields="IproPrdlnNM"
                DataMember="odsPrdln_DefaultView" DataSourceID="hdsPrdln" Key="odsPrdln_DefaultView">
                <ClientEvents DoubleClick="hdgPrdln_DoubleClickPostBack" />
                <Columns>
                    <ig:BoundDataField Hidden="false" DataFieldName="IproPrdlnNM" Key="IproPrdlnNM"  >
                        <Header Text="Product Line" />
                    </ig:BoundDataField>
                </Columns>
                <Bands>
                    <ig:Band AutoGenerateColumns="false" DataMember="odsPrd_DefaultView" Key="odsPrd_DefaultView"
                        DataKeyFields="SrcSysPrdIDKey">
                        <Columns>
                            <ig:BoundDataField Hidden="false" Width="30px" DataFieldName="SrcSysPrdIDKey" Key="SrcSysPrdIDKey">
                                <Header Text="ID" />
                            </ig:BoundDataField>
                            <ig:BoundDataField Hidden="false" DataFieldName="SrcSysPrdNM" Key="SrcSysPrdNM">
                                <Header Text="Product Name" />
                            </ig:BoundDataField>
                            <ig:BoundDataField Hidden="false" DataFieldName="SrcSysNM" Key="SrcSysNM">
                                <Header Text="Source System" />
                            </ig:BoundDataField>
                            <ig:BoundDataField Hidden="false" DataFieldName="SrcSysUniqID" Key="SrcSysUniqID">
                                <Header Text="Unique ID" />
                            </ig:BoundDataField>
                        </Columns>
                    </ig:Band>
                </Bands>
                <Behaviors>
                    <ig:Activation>
                    </ig:Activation>
                    <ig:Selection CellClickAction="Row" RowSelectType="Single">
                    </ig:Selection>
                    <ig:EditingCore AutoCRUD="False">
                        <Behaviors>
                        </Behaviors>
                    </ig:EditingCore>
                </Behaviors>
            </ig:WebHierarchicalDataGrid>

<ig:WebHierarchicalDataSource ID="hdsPrdln" runat="server">
                <DataViews>
                    <ig:DataView ID="odsPrdln_DefaultView" DataMember="DefaultView" DataSourceID="odsPrdln" />
                    <ig:DataView ID="odsPrd_DefaultView" DataMember="DefaultView" DataSourceID="odsPrd" />
                </DataViews>
                <DataRelations>
                    <ig:DataRelation ChildColumns="IproPrdlnNM" ChildDataViewID="odsPrd_DefaultView"
                        ParentColumns="IproPrdlnNM" ParentDataViewID="odsPrdln_DefaultView" />
                </DataRelations>
            </ig:WebHierarchicalDataSource>
            <asp:ObjectDataSource ID="odsPrdln" runat="server" SelectMethod="GetMultipleAsObject"
                TypeName="ITSMR_Data.IproPrdlnClass"></asp:ObjectDataSource>
            <asp:ObjectDataSource ID="odsPrd" runat="server" SelectMethod="GetMultipleAsObject"
                TypeName="ITSMR_Data.PrdPrdlnHierarchyROClass"></asp:ObjectDataSource>

Not sure what I may be missing. Thanks for your help!        

Jon